Can you love someone but not always like them?

I have a very close relationship with my Nana, I help care for her, so we often talk about our lives, she talks about being married to my Pops and I talk about my relationship with my boyfriend. It often turns into a discussion about how times have changed and that relationships aren't anything like they were in her day. She told me something the other day about her and her husband, she said she loved him very much but she didn't always like him. It seemed to resonate with me a lot as I love my boyfriend very much but sometimes I just don't like him. Do you think it's possible to love someone but not like them all the time? Is it a natural and healthy thing to do? Or do people think that there is an underlying issue?